STS-54

Learn about this topic in these articles:

role of Helms

…spaceflights, the first on the STS-54 mission (January 13–19, 1993) of the space shuttle Endeavour, which launched a Tracking and Data Relay Satellite. Her second spaceflight, STS-64 (September 9–20, 1994) on Discovery, carried an experiment that used lasers to measure aerosols in Earth’s